If a skater of weight 3 kg has initial speed 32 ms'1 and second one of weight 4 kg has 5 ms'1 and after collision they have combined speed 5ms'1, then the loss in kinetic energy is

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If a skater of weight 3 kg has initial speed 32 ms'1 and second one of weight 4 kg has 5 ms'1 and after collision they have combined speed 5ms'1, then the loss in kinetic energy is